Symbol used to represent magnetic field.
Φ
B
H
Which of the following statement is incorrect? The speed of rotation can be increased by,
increasing the strength of current
increasing the number of turns of coil
increasing the area of coil
decreasing the strength of magnetic field
Which of the following statement is right?The magnetic field lines become denser if.
Strength of current in the loop is increased.
There is more number of turns in the loop.
If less number of turns in the loop.
Both 1 and 2
The magnetic field lines inside a current carrying solenoid are:
along the axis and parallel to each other.
perpendicular to the axis and equidistant from each other.
circular but they do not intersect each other.
circular at the ends inside the solenoid.
Which of the following is incorrect?
In a step up transformer?
Ns = Np
Ns < Np
Ns > Np
Nothing can be said
At the ends, the current carrying solenoid behaves like
bar magnet with different polarities
compass needle
bar magnet with fixed polarity
current carrying coil
In a step down transformer?
Ns / Np < 1
Ns / Np > 1
Direction of induced emf can be obtained from
Lenz's law
Flemings right hand rule
Flemings left hand rule
Device which converts mechanical energy to electrical by using principle of electromagnetic induction.
AC generator
DC motor
Transformer